Scissors



' Patented Oct. 2,1923.

UNITEDr SCISSO El r=` Application led 4.August G, 1921. Serial No. @$0,332.

To all whom t may concern.'

Be it known that I, CHARLES R. STORZ, a citizen of the United States, residing at New York in the borough of Brooklyn, county of lings, and State of New York, have invented certain new and useful lmprovements in Scissors;andl[do hereby de- Iclare the following to be a full, clear, and

exact description of the same, reference being had to the accompanying drawings, forming part of this specification.

This invention relates to scissors and shears having detachable blades and relates particularly to the method of securing the cutting blade to the shear arin. The principal object of the resent invention is to provide a simple an eilicient method of se curing the cutting blade to the cutting arm. One of the features of the present invention is the use of a stud having lateral extensions as the principal attaching means for securing the cutting blade to the arm, and the secondary features of the invention lie in the additional means for holding the blade in position on the pivot, irrespective of the particular kind of pivot used in securing the two shear arms together, since the main pivot of the shears is not necessarily relied upon in any way to secure the cutting blades in position.

The device here illustrated is of particular importance in surgical scissors, but the invention is not limited in any way to such use, many of the styles of this cling-blade type being intended for regular general or domestic use.

The thought of having detachable blades to a pairof scissors or shears, is not new with the present invention, having been previously proposed, but `as far as I am aware, it is new to secure the cutting blades to the arms by a positive lock, consisting of a French pivot spaced away from the main pivot of the arms and by using one or more lugs to prevent displacement of the.. cutting blade about its pivot, relying on the resiliency of the metal to insure a snug lit of the blade on its arm. By French pivot l mean the stud element of a French lock,

-such pivot having a circular portion and also having a non-,circular head usually diamond-shape, double convex or elliptical, and in the French lock the other element has a slot which exactly fits the head of the stud in one position, and when the two with or secured to the arm.l In each of. the

examples illustrated, the securing pivot is located somewhat near the center of the blade, which l ind to be by far the best practice. lt will be understood, of course, that my invention contemplates the use of a securin pivotJ at any point whatsoever on the bla e, as, for example, at a point near the outer end of the7 blade, provided the scissors are of the blunt point type. llt will also be obvious that two or more pins may be provided to prevent rotation of the cutting blade about the securing pivot, although, in practice, a single locking means has always been found ample.

in the drawings,-

Figure l is a general or plan view of a pair` oi scissors, in accordance with the present invention.

Fig. 2 is a view of the scissors disassemf bled and showing the inner faces of both blades.

Fig. 3 is a transverse kvertical lsection through the main pivot of the scissors.

Fig. t is a similar view through the se# curing pivot.

Fig. 5 is a view taken through the center of the integral locking lug of the cutter blade.

Fig. 6 is a longitudinal sectional view taken through the two pivots and the locking` lug.

ig. 7 is a view similar to Fig. 6, but

showing a modification which employs a locking pin on the shear arm, instead of a locking lug on the cutting blade, as in to be resharpened, since they can be replaced at a less cost' than the usual price of sharpening a pair of shears. Y

.ln the embodiment shown in Figs. l and incassa below the level of the top of the pivot. rlhe slot 34 in plan view is of thesame size and shape as the plan view of the head 23,-so that the cuttin blade may be placed trans- 6, the arms 1t and 15 of the frame are sea-esversely to the s ear arm to fit over the headl cured together by means of a French pivot consisting of an elliptical head 18 rising from a cylindrical stud 19 which may be integral with the arm la, but for manufacturing reasons is usually separate and then riveted or otherwise secured to the arm. The head of this stud lits a spherical recess 20 in the arm 15, such recess having an opening therein of the same size and elliptical shape as the plan of the head 18. rlhis French pivot is not new with me and neither is this particular use of the French pivot to form the main pivot of the pair of shears new at the resent time, although it is new as a means or securing the cutting blade to the arm, and it is also new to strike out a spherical recess for the French pivot, so that the struck out portion Will engage the recess below the head of the pivot. For certain types l prefer to use the ordinary screw pivot to secure the arms together.

lin Fig. 2 the elliptical or rather double convex head 23 of the securing pivot has its major axis transverse to the length of the shear arm, whereas, in the modification shown in Fig. 7, the similar head 24 has its major axis parallel to the length of the arm, and since, in the modification, the main pivot is a screw, it is unnecessary to provide a slot similar to the slot 25 in the cutting blade 16, this slot being preferable to the large size opening that would be re quired to clear the main pivot 19 and also avoiding the bending of the blade to the large extent that wouldbe necessary if the cutting blade were required to pass over the main pivot stud.

.At the outer end the blade 16 is provided with a locking lug 29 which is formed by punching two parallel slits in the blade and bowing out the metal between the slits into the shape best seen in Fig. 6. A relatively long shallow groove 30 is cut in the metal of the arm to receive this lug 29. As usual in the art, the contour of the cutting blade follows exactly the coutour of the shear arm having the usual rounded point 32 and the triangular inner end 33.

Referring particularly now to Fig. 5, it will be noted` that the metal of the blade 16 is punched down on either side of the slot 3d, forming a spherical depression 35 on the to face of the blade and forming a similar spherical projection 36 on the side of the blade engagin the shear arm la. This construction is o? considerable importance, as it not only avoids weakening the blade by counter-sinking, but it provides a much` more ecient joint with ample metal' for nal shaping by grinding without cutting et the French pivot and upon turning the blade-about such pivot a very snug engagement will be had. As soon as the blade and arm are parallel the locking lug 29 will snap into thegroove 30 and the lade and arm will then be found to be in close contact throughout the entire length of the blade, the form of the blade being such as to cause the cutting blade to cling to the shear arm.

ln the modification shown in Fi 7 the locking lug 29 is replaced by a sma l cylindrical pin 40 secured to or integral with the shear blade 41, such pin en aging a circular hole 42 in the cuttin bla e 4:3. As previously stated, the re ative location of the locking pin 4:2 and the securing pivot 2t Ina be reversed, but the form illustrated is believed to be the most advantageous and desirable.

What is claimed is:

1. A detachable cutting blade having a concave recess and a non-circular orifice through a portion of said recess.

2. A detachable cutting blade having a spherical depression with an elliptical orifice therein, said recess and orifice forming part of a pivotal connection.

3. A detachable cutting blade for a Scissor arm having a plurality of perforations therethrough, one of said perforations being adapted to receive the non-'circular head of a pivotal stud to secure the blade to the scissor arm.

t. A detachable cutting blade for a scissor arm having a pivot socket for securing said blade to the arm, an orice to receive the main pivot of the scissors and an additional means cri-operating with said scissor arm to lock the blade against rotation about said pivot.

5. lin a cutter, a pair of shear arms', a pivot for said arms, a detachable resilient cutting blade for each shear arm, a securing pivot on each arm for the attached blade, and projection-and-recess means for locking each of said blades against rotation about its securing pivot.

6. A shear arm for use with detachable blades, characterized by the provision of a cylindrical blade-securing pivot having a non-circular head, said pivot being spaced from the main pivot of the shears.

7. A detachable cutting blade for a scissor arm characterized by the provision of a spherical projection pressed out to one side of the blade and having a non-circular opening therein, the greatest length of said opening being substantially equal to the diameter of the projection.

aecaaaa i a near one end' of the blade, an integral lug near the other end of the blade, and a pressed out projection between said opening Y and said lug and slotted to receive a loc-king pivot. i

10. A scissor or shear shank having ay projection provided with an elongated portion having an inclined edge, and a blade to fit -on said shank and provided -with an elonto receive said projection,

gated openin the reater dimension of said opening extending at a, substantial angle to the greater dimension of said projection when the blade is assembled lengthwise von the shank, a wall of said opening` along its greater dimension having an inclined portion to cooperate with the, inclined portion .of the projection, the outer surface of the blade beingunobstructed by the projection, the blade being pivotally retained by said projection on the shank in d iderent angular positions-of the blade thereon.

11. A scissor or. shear shank having aprojection provided with an elongated portion having an inclined edgewanda blade to t l on said shank and provided with an elongated opening to receive said projection, the greater dimension of said opening extending at a substantial angle to the greater dimension of said projection-when the blade is as sembled lengthwise on the shank, a wall of said opening along its greater dimension having an inclined, rtion to coopenate l with the inclined portion of the projection,

the outer surface ofthe blade being unobstructed by the projection, the blade being. ,pivotally retained by sald projection on the Shank indifferent angular'positions of the. blade thereon, and 'means on the shank to engage the blade to prevent dis-assembling of the blade and shank without lateral placement of the blade.

12. A' scissor or shear shank 'provided with a proection having an elongated por-' ing crosswise of the shank and having an inclined edge extending length- 'wise of the shank, and a blade having an elongated opening cxtendin lengthwise of the blade and provided with an inclined wall te cooperate with said inclined edge, means to prevent edgewise motion of the blade on the shank in either direction, the blade being rotative in two directions for assembling on the shank relatively to said projectionfthe blade bein rotatively retained by the projection on t e shank in diferent angulailpositions while being assembled on the sha j i3. A scissor or shear shank provided with a pro'ection-having an elongated portion exten ing crosswise of the shank and having an inclined edge extending lengthwise of the shank, and a blade having an elongated opening extending lengthwise of the blade and provided withV an inclined wall to cooperate with said inclined edge, the blade being rotative relatively to said projection for assembling on the shank, the

shank having one or more pins and the blade having one or more' holes to receive said pins, said projection retaining the blade on the shank and the pin or. pins retaining the blade from edgewisedisplaccment on the shank, the bladerequiring flexing laterally to admit the pins 1n said holes and to ,release the blade from the pins.

14. A scissor or shear shank having a pro- I jection, and a blade to fit lengthwise on said shank, said blade having an opening to rotatively receive said projection, said projection and opening having cooperating means to retain .the blade on the shank with the blade lengthwise and in different angular positions on the shank, the blade being rotative in two directions relatively to the shank to assemble and dis-assemble them.

15. A. scissor or shear shank having a projection, and'ablade to fit-,lengthwise on said shank, said blade having an openin to rotatively receive said projection, sai projection and opening having cooperating means to retain the Ablade on the shank with the blade lengthwise and in different angular positions on the shank` and. means on the -shankto engage the blade'to prevent dis-as- .sembling thereof without lateral dis lacef ment thereof, said means retaining the -lade from edgewise displacementwhen in operative position on the shank.

" .CHARLES R. STORZ. 

